rheum vs sniffles

rheum

noun
  • Watery or thin discharge of serum or mucus, especially from the eyes or nose, formerly thought to cause disease. 

  • Tears. 

  • Illness or disease thought to be caused by such secretions; a catarrh, a cold; rheumatism. 

sniffles

noun
  • The symptom of a runny or congested nose accompanying a cold. 

How often have the words rheum and sniffles occurred in a corpus of books? (source: Google Ngram Viewer )